LTC4313IMS8-3#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4313IMS8-3#PBF is a hot swappable 2-wire bus buffer supporting I2C, SMBus, and PMBus protocols. It operates with a supply voltage range of 2.9V to 5.5V and supports level translation for buses down to 1.4V. The device provides bidirectional buffering with a high noise margin (VIL = 0.3•VCC) and includes rise time accelerators in the -1/-2 variants, though the -3 variant lacks these features. Key electrical parameters include a maximum clock frequency of 400kHz, propagation delay of 130ns, and input capacitance of 10pF. It functions within an ambient temperature range of -40°C to +85°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for 2-wire busses while maintaining high noise margins up to 0.3 times VCC.
• Supports live board insertion and removal by pre-charging SDA and SCL lines to minimize bus disturbances.
• Includes automatic stuck bus disconnect and recovery logic that generates clock pulses to free stuck busses.
• Offers level translation capabilities between various bus voltages including 1.5V, 1.8V, 2.5V, 3.3V, and 5V.

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffering to increase fanout on I2C and SMBus networks
• Live board insertion and removal protection in telecommunications systems like ATCA
• Level translation between different voltage domains such as 3.3V and 1.8V
• Capacitance buffering and bus extension in server and PMBus applications

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix '-3' indicates the absence of Rise Time Accelerators compared to other variants. Confirm the MSOP-8 package type matches the design requirements. Ensure the operating temperature grade 'I' (-40°C to +85°C) aligns with the system environment. Check RoHS compliance status if required by local regulations.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this part when level translation to lower voltages like 1.8V or 1.5V is required without the need for active rise time acceleration. Compare against -1 and -2 variants if stronger pull-up currents are needed for heavily loaded busses. Consider the 10pF input capacitance for high-speed signal integrity. Verify that the 400kHz maximum frequency meets the system timing constraints.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4313 family of 2-wire bus buffers from Analog Devices. It shares the same core architecture and pinout with the LTC4313-1 and LTC4313-2 but differs in feature set regarding rise time acceleration. The IMS8 suffix denotes the 8-lead plastic MSOP package suitable for surface mount applications.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4313IMS8-1#PBF: Includes strong slew-limited switch RTAs. LTC4313IMS8-2#PBF: Includes 2.5mA current source RTAs. Both support higher voltage levels but lack the specific low-voltage optimization of the -3 variant.